Electric device



sept.29,1925. '1,555,076

-E. RABONI ELECTRIC DEVI CE Filed Sept. 19, 1923 Edurdo Ran,

Iuzenor:

Patented Sept. 29, 1925.

UNITED STATES" .EDUARDO RABONI, O'F NEW YORK, N. Y,

ELECTRIC DEVICE.

Application filed September 19, 1923, Serial No. 663,588.

To all whom t may concern:

Be 1t known that I, EDUARDO RABONI, a

l citizen of the Republic of Uruguay, and

resident of New York, in the county and State of New York, haveinventedrcertain new and useful Improvements in Electric Devices, ofwhich the following is a specil cation.

My invention relates to electrical appara'- tus as commonly used withbells, buzzers, enunciators, or the like, and the principal object ofthe invention is the provision of a certain form of electromagnets andoperating mechanism whereby a very compact de'- vice can be secured, andwhich will, for this reason, be cheap to manufacture.

Other advantages and objects will be apparent as the descriptionproceeds, and consist to a, large extent in the combination,construction and arrangement of parts illustrated and described.

I have illustrated in the accompanying drawings, various embodiments ofmy invention, but it is understood that the forms herein illustrated aremerely the best eX- amples of which I am now aware.

In these drawings Figure 1 is a plan view, partly in section forclearness of illustration, of the buzzer form.

Fig. 2 is a transverse section taken substantially centrally of Fig. 1.

Fig. 3 is a plan view of the bell form.

Fig. 4 is a. vertical central section of Fig. 3.

Figs. 5, 6 and 7 are views of details.

I have found that I may expeditiously make use of an 'ordinary stockrivet of magnetic metal, as at 1, in forming the magnet core for use inthese devices. When such an element is wrapped with a coil, as at 2, andthe ends connected with a suitable source of energy, magnet flow will beinduced through the core 1, as is well known in this art. A perforateddisc 3 of fibre, hard rubber, or other suitable insulating material, mabe placed over the end of the rivet 1, which will form a. suitableshoulder against which the windings 2 may be built. If the disc 3 isplaced slightly below the end of the rivet 1, the projecting part 1l ofthe rivet will be free from obstruction in attracting magnetized metalthereto.

In the embodiment of a buzzer as shown in Fig. 1, I may provide a base 4of wood, porcelain, fibre, or any other suitable material, which issuitably cored from one side thereof to form an aperture 5; In case thebase 4 is of porcelain, this aperture will be molded therein in theproduction of the base. l/Vithin the aperture 5 I place a pair ofelectromagnets 6 constructedas above, arranged in a single circuit. Oneend of the wrapping 2 is passed through an aperture in the base '4 whichhas its outletin proximity to the terminal 7 to which said lead wire isattached. The other end of the winding 2 vit attached as at 8 toa'fiexible copper sheet 9 which overlies the electromagnets 6, and hasone end 10 bent upward and in contact with fthe base of each rivet ineach electromagnet in order that the two magnets may be included in onemagnetic circuit. The flexible copper plate 9 is at thevfront end ofthe' electromagnet, bent at right angles upwardly and then back uponitself downwardly, as at 11, the free end thereof being again bentupwardly to form a spring contact member 12, for a purpose more fullydescribed hereinafter. The portion 11 is held in a slot 13 in the centerof an iron hammer or weight 14 for a purpose hereinafter set forth. l

A screw 15 having the threads thereof removed from one end'to form asmooth contact portion 16, is inserted into the base 4 through anaperture provided for this purpose, the head of the screw being countersunk to a position iush with, or below the plane of the side containingthe screw aperture. A lead wire 17 connects this screw through the base4, to the second terminal 18. The screw 15 penetrates the base 4 to anextent sufficient to make contact with the springend 12 of the plate 9.The circuit for the device is as follows :-Beginning with the terminal7, Athrough the electromagnets 6 to the plate 9, upon which the circuitis grounded as shown at 8, along the yplate 9 to the spring end 12, fromthere to the screw 15, and finally to the terminal 18. It will thus beapparent that if for any reason the spring end 12 is moved out ofcontact with the screw 15, the circuit will be broken. If then theterminals 7 and 18 are connected with a suitable source of energy, asfor in stance a dry cell battery, the cores 1 in the electromagnets 6will become energized and will attract the hammer 14 thereto, which ininclining toward the magnetized cores, will break the circuit betweenthe screw 15 and end 12. Thus the circuit will be interrupted,

'the cores will become deenergized, and the hammer 14 and springend 12will fall back to its normal position, which will again make thecircuit, and the cycle is repeated. It willk tractive appearance of thedevice, but which also makes such a construction of simple character andcheap to manufacture,

I have shown a 'removable plate 1,9 covering an aperture which exposesthe buzzing mechanism, as this may be found desirable in `someinstances, although it will be Vreadily seen that such an aperture isnot needed, as the entire mechanism can be inserted from, and taken outof, ,the aperture in the edge of the base 4. i

Sealing wax 20, or other suitable plugging means, is used to cover theaperture in the side of the base.

v.In ,applying such a structure to an electric bell rather than abuzzer, I use a base 4a which is provided with two apertures therein ofa size to receive two electromagnets 6. The windings of these coils areconnected together so that the two magnets are in the same circuit, oneend 22 of the coil being connected tothe terminal 23, and the other end24 to the hammer mechanism. The hammer mechanism consists of a piece ofspringv metal 26 secured to the base as by means of pin 27. To thespring metal 26 is secured the iron hammerproper 28, which consists of astrip of material heavier than the spring portion 2,6, deformed as at 29to form an inclined hammer Vor striker 30. That portion ,of the striker28 adjacent Vthe spring metal 26 is formed with upstanding walls crimpedupon the spring metal 26 as at 31. One end .of the spring metal 26 kisturned upwardly as at 32, for a purpose more fully describedv hereafter.A metallic bridge 33'secured to the base 4%, overlies the hammermechanism, and the spring end 32 is normally placed in Contacttherewith. A lead 34 connects the bridge 33 with the terminal 35.

The circuit for the current is as follows Entering at the terminal 23,it passes around the electromagnets 6 to the hammer mechanism andthrough the spring end 32 to the bridge 33, which conducts it throughlead 34 to the terminal 35. Thus when the terminals 23 and 35 areconnected to a source of energy, the cores, which will be magnetized,will cause the iron hammer 28 to be attracted thereto, which will causein turn the spring end 32 to leave the bridge 33, thus breaking thecircuit. Upon this event, the cores will become deenergized and thehamm'er 28 vunder action of the spring portion 26, will again causecontact to be made between the parts 32 and 33 and the cycle isrepeated.

A bell 36 is secured to the base in a man-- ner to cause its fullresonance to be secured, and is arranged in such proximity to thcstriker 30 that each oscillation thereof will cause the striker 30 tocontact with the bell 36.

A n expeditious manner ofV attaching the bell to the block 4a isillustrated and shown to consist of a screw element 37, the head ofwhich is formed into an oblong shape. This oblong extremity is nowpassed through `a similar hole in the bell, the projecting parts 38being separated by a suitable implement, which thus securely rivets thebell to the screw element 37. This screw element and bell assembly maynow be screwed into a hole in the base provided for this purpose. Ametallic insert 39 connects the two cores in the electromagnets to causethe magnetic flow to include both cores.

I-Iaving thus described my invention, what I claim is:

In combination, a base of insulating material, an aperture therein, -anelectromagnet located in said aperture, a flexible sheet of springmaterial one end of which extends beneath the electromagnet, the otherend constituting a make and break device, its intermediate portioncarrying an iron hammer.

In testimony whereof I affix my signature.

EDUARDO RABONI.

